presignature is missing when all nodes have same presignature count

[ppca]

When a lot of presignatures are being generated, and we want to generate signature at the same time, we always see “presignature is missing”, but all nodes have same number of presignatures

[volovyks]

Can it be the reason for #851 ?

[ppca]

Last time we found out one mainnet node was not able to respond and after we fix it, it was good. This time it happens on testnet

[ChaoticTempest]

#869 should resolve this as we don't store presignatures currently causing a misalignment in the number of presignatures on nodes when we do a node upgrade